Isn't it a jutsu that makes them explode?(Nope. ~TU3)
At the very least exploding should be on Truth-Seeking Ball as a usage.
They don't "explode", at most they expand and then return to their normal size.
Jashin Uchiha wrote: Whats with the light coming off them?
Most likely a signal that they're going to expand. The point is that the black orbs don't disappear when they "explode", as you say.
Jashin Uchiha wrote: If it isn't an explosion why did Obito shield himself?
These were Tailed Beast Balls.
The TSB he attached to Minato that Tobirama brought back to him, he shielded himself from that.
Jashin Uchiha wrote: The TSB he attached to Minato that Tobirama brought back to him, he shielded himself from that.
Sorry, I thought you were talking about the moment when Obito tried to wipe out the Alliance. Well, Obito shielded himself because otherwise he would've been caught in his own attack.
If it expanded he could have made it go around his body rather than shield himself with more of them, I think the "explosion" is a really dense blast of chakra that way the TSB remains at the origin of the blast and Obito would need to protect himself.